User guide

The root is reported as the coordinate pair (−0.5, 0). Finding multiple roots
follows the same process as explained above with a simple toggle between
roots.
Example 8. Let y2 = x
2
− 10. Since we wish only to view y2, we will
uncheck y1 and return to this function for a later example.
Note that our graph crosses the x-axis at two places and hence has two roots.
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